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ive had an injector stick open then it would dump fuel into the cylinder bore whe parked , and blow white smoke upon startup. it wasn't caused by a new pope ;-) I think you would have caught that if it was the cause.
I was just reading anbother post referring to the coil, and it went into depth explainng how the coil charged and how it has less time to charge at higher RPMs , the factory engineers probably did not make bad decisions on the ratio of the windings etc but some coils ou there seem to perhaps a bit falsely adverticse that swapping to their new fangled coil with a different ration , perhaps a higher output voltage , imporoves the spark.
it seemed to suggest that installing a "hotter" coil could actually cause the transistor in the ECU or I shoudl say MCE to degrade and that the programming may be adapted change this charge rate. I wondered if perhaps a higher RPMs if there was misfiing going on that wasnt; that noticible?
it made a valid point that at high rpms the time for the coil to charge for it's next spark is shortened and that would make the spark weaker.. and I assume a coil with a different winding ratio may influence this.
I dont have the theory to back all that up nor the experience. im as confuesed as anyone about your real cause of the poor mileage. Nothing I said above was said with a wealth of experience under my belt so take it with a pinch of salt.
i wonderd if you had updated to a coil with a different winding ratio and if swapping to the OEM one might affect the mileage?
obviously driving habits are an influence in mileage so in the city if you are using wide open throttle well That could be quite habitual for some and "never" for others. eg some will go wide open throttle when the next light is red, because they are enjooying doing so mostly,
Others think ahead and want o save fuel and may think well im going fast enough to coast to the light before it changes so why would I apply any more throttle? Ill lay off and allow my momentup to get me there in time for the light ot change because anything other is just a waste of gas.
some may even change their pace to avoid stopping and starting as each start uses fuel , truckers are masters at this. they will percieve the other light to predict more closely . when its going to change.
no matter of your personal habits you are probably still comparing oranges to oranges because any changes will reflect the same driving habits.
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